From The Collaborative International Dictionary of English v.0.48:

Oleaceous \O`le*a"ceous\, a. [L. ol['e]aceus of the olive tree.]
   Of, pertaining to, or resembling, a natural family of plants
   (Oleaceae), mostly trees and shrubs, of which the olive is
   the type. It includes also the ash, the lilac, the true
   jasmine, and fringe tree.
   [1913 Webster]
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